JavaFX: Move node to front

To move any node to front position, simple toFront() method of the object. The method toFront() moves this Node to the front of its sibling nodes in terms of z-order. This is accomplished by moving this Node to the last position in its parent's content ObservableList. This function has no effect if this Node is not part of a group.

reference: http://docs.oracle.com/javafx/2/api/javafx/scene/Node.html#toFront()

Modify the code in last example JavaFX: Drag and Move something, call ((Circle)(t.getSource())).toFront() in handle(MouseEvent t) of circleOnMousePressedEventHandler to move the clicked circle to front position.

Move circle to front position

package javafx_drawsomething;

import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Cursor;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.input.MouseEvent;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;

/**
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFX_DrawSomething extends Application {
    
    Circle circle_Red, circle_Green, circle_Blue;
    double orgSceneX, orgSceneY;
    double orgTranslateX, orgTranslateY;
    
    @Override
    public void start(Stage primaryStage) {
        
        //Create Circles
        circle_Red = new Circle(50.0f, Color.RED);
        circle_Red.setCursor(Cursor.HAND);
        circle_Red.setOnMousePressed(circleOnMousePressedEventHandler);
        circle_Red.setOnMouseDragged(circleOnMouseDraggedEventHandler);
        
        circle_Green = new Circle(50.0f, Color.GREEN);
        circle_Green.setCursor(Cursor.MOVE);
        circle_Green.setCenterX(150);
        circle_Green.setCenterY(150);
        circle_Green.setOnMousePressed(circleOnMousePressedEventHandler);
        circle_Green.setOnMouseDragged(circleOnMouseDraggedEventHandler);
        
        circle_Blue = new Circle(50.0f, Color.BLUE);
        circle_Blue.setCursor(Cursor.CROSSHAIR);
        circle_Blue.setTranslateX(300);
        circle_Blue.setTranslateY(100);
        circle_Blue.setOnMousePressed(circleOnMousePressedEventHandler);
        circle_Blue.setOnMouseDragged(circleOnMouseDraggedEventHandler);
                
        Group root = new Group();
        root.getChildren().addAll(circle_Red, circle_Green, circle_Blue);
        
        primaryStage.setResizable(false);
        primaryStage.setScene(new Scene(root, 400,350));
        
        primaryStage.setTitle("java-buddy");
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
    
    EventHandler<MouseEvent> circleOnMousePressedEventHandler = 
        new EventHandler<MouseEvent>() {

        @Override
        public void handle(MouseEvent t) {
            orgSceneX = t.getSceneX();
            orgSceneY = t.getSceneY();
            orgTranslateX = ((Circle)(t.getSource())).getTranslateX();
            orgTranslateY = ((Circle)(t.getSource())).getTranslateY();
            
            ((Circle)(t.getSource())).toFront();
        }
    };
    
    EventHandler<MouseEvent> circleOnMouseDraggedEventHandler = 
        new EventHandler<MouseEvent>() {

        @Override
        public void handle(MouseEvent t) {
            double offsetX = t.getSceneX() - orgSceneX;
            double offsetY = t.getSceneY() - orgSceneY;
            double newTranslateX = orgTranslateX + offsetX;
            double newTranslateY = orgTranslateY + offsetY;
            
            ((Circle)(t.getSource())).setTranslateX(newTranslateX);
            ((Circle)(t.getSource())).setTranslateY(newTranslateY);
        }
    };
}

Next: Apply Shadow effect while moving the Circles